DELL COMPUTER CORPORATION
=========================

   SYSTEMS 4XX/V & 4XX/DV

   Processor    80486SX/80487SX/80486DX/ODP486SX/80486DX2         
   Processor    33/50(internal)/66(internal)MHz                   
   Speed        
   Chip Set     Opti                                              
   Max. Onboard 64MB                                              
   DRAM         
   Cache        128/256KB                                         
   BIOS         Unidentified                                      
   Dimensions   330mm x 218mm                                     
   I/O Options  32-bit VESA local bus slots (2), floppy drive     
                interface, IDE interface, parallel port, PS/2     
                mouse port, serial ports (2), VGA feature         
                connector, VGA port                               
   NPU Options  None                                              

<gopher://bitreich.org/I/th99/m/C-D/32013-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose           | Location | Purpose          | Location |
   |-------------------+----------+------------------+----------|
   | PS/2 mouse port   |   CN1    | VGA connector    |   CN8    |
   |-------------------+----------+------------------+----------|
   | Serial port 1     |   CN2    | VGA feature      |   CN9    |
   |                   |          | connector        |          |
   |-------------------+----------+------------------+----------|
   | Serial port 2     |   CN3    | IDE interface    |   CN11   |
   |                   |          | LED              |          |
   |-------------------+----------+------------------+----------|
   | External battery  |   CN4    | Speaker          |   CN12   |
   |-------------------+----------+------------------+----------|
   | Parallel port     |   CN5    | Power LED        |   CN13   |
   |-------------------+----------+------------------+----------|
   | IDE interface     |   CN6    | Reset switch     |   CN14   |
   |-------------------+----------+------------------+----------|
   | Floppy drive      |   CN7    | 32-bit VESA      | SL1, SL2 |
   | interface         |          | Local bus slots  |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function               | Jumper  | Position  |
   |--------------------------------------+---------+-----------|
   |>> | Built in VGA subsystem enabled   |   JP1   |  Closed   |
   |---+----------------------------------+---------+-----------|
   |   | Built in VGA subsystem disabled  |   JP1   |   Open    |
   |---+----------------------------------+---------+-----------|
   |>> | Factory configured - do not      |   JP2   |   Open    |
   |   | alter                            |         |           |
   |---+----------------------------------+---------+-----------|
   |>> | Factory configured - do not      |   JP3   |  Closed   |
   |   | alter                            |         |           |
   |---+----------------------------------+---------+-----------|
   |>> | Factory configured - do not      |   JP4   |  Closed   |
   |   | alter                            |         |           |
   |---+----------------------------------+---------+-----------|
   |>> | Factory configured - do not      |   JP7   |  Closed   |
   |   | alter                            |         |           |
   |---+----------------------------------+---------+-----------|
   |>> | 80486SX installed in PQFP        |  JP10   |   Open    |
   |---+----------------------------------+---------+-----------|
   |   | 80486SX not installed in PQFP    |  JP10   |  Closed   |
   |---+----------------------------------+---------+-----------|
   |>> | Factory configured - do not      |  JP11   |   Open    |
   |   | alter                            |         |           |
   |---+----------------------------------+---------+-----------|
   |>> | 256K of cache memory installed   |  JP12   |  Closed   |
   |---+----------------------------------+---------+-----------|
   |   | Zero or 128K of cache memory     |  JP12   |   Open    |
   |   | installed                        |         |           |
   |------------------------------------------------------------|
   | Note:The exact location of JP11 on system board is         |
   | unidentified by the manufacturer.                          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   | Size |   Bank 0    |   Bank 1    |   Bank 2   |   Bank 3   |
   |------+-------------+-------------+------------+------------|
   | 4MB  | (1) 1M x 36 |    NONE     |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 8MB  | (1) 1M x 36 | (1) 1M x 36 |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 12MB | (1) 1M x 36 | (1) 1M x 36 |  (1) 1M x  |    NONE    |
   |      |             |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 16MB | (1) 1M x 36 | (1) 1M x 36 |  (1) 1M x  |  (1) 1M x  |
   |      |             |             |     36     |     36     |
   |------+-------------+-------------+------------+------------|
   | 16MB | (1) 4M x 36 |    NONE     |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 20MB | (1) 4M x 36 | (1) 1M x 36 |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 24MB | (1) 4M x 36 | (1) 1M x 36 |  (1) 1M x  |    NONE    |
   |      |             |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 28MB | (1) 4M x 36 | (1) 1M x 36 |  (1) 1M x  |  (1) 1M x  |
   |      |             |             |     36     |     36     |
   |------+-------------+-------------+------------+------------|
   | 32MB | (1) 4M x 36 | (1) 4M x 36 |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 36MB | (1) 4M x 36 | (1) 4M x 36 |  (1) 1M x  |    NONE    |
   |      |             |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 40MB | (1) 4M x 36 | (1) 4M x 36 |  (1) 1M x  |  (1) 1M x  |
   |      |             |             |     36     |     36     |
   |------+-------------+-------------+------------+------------|
   | 48MB | (1) 4M x 36 | (1) 4M x 36 |  (1) 4M x  |    NONE    |
   |      |             |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 52MB | (1) 4M x 36 | (1) 4M x 36 |  (1) 4M x  |  (1) 1M x  |
   |      |             |             |     36     |     36     |
   |------+-------------+-------------+------------+------------|
   | 64MB | (1) 4M x 36 | (1) 4M x 36 |  (1) 4M x  |  (1) 4M x  |
   |      |             |             |     36     |     36     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   | Size  |   Bank 0    |   Bank 1   | TAG (U42)  | TAG (U27)  |
   |-------+-------------+------------+------------+------------|
   |  0KB  |    NONE     |    NONE    |    NONE    |    NONE    |
   |-------+-------------+------------+------------+------------|
   | 128KB | (4) 32K x 8 |    NONE    | (1) 16K x  | (1) 32K x  |
   |       |             |            |     1      |     8      |
   |-------+-------------+------------+------------+------------|
   | 256KB | (4) 32K x 8 | (4) 32K x  | (1) 16K x  | (1) 32K x  |
   |       |             |     8      |     1      |     8      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   |       Size       |        JP8         |        JP9         |
   |------------------+--------------------+--------------------|
   |      128KB       | pins 1 & 2 closed  | pins 1 & 2 closed  |
   |------------------+--------------------+--------------------|
   |      256KB       | pins 2 & 3 closed  | pins 2 & 3 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   | CPU Type  |  JP13  |       JP14        |       JP15        |
   |-----------+--------+-------------------+-------------------|
   |  80486SX  |  Open  |       Open        | pins 2 & 3 closed |
   |-----------+--------+-------------------+-------------------|
   |  80486DX  | Closed | pins 1 & 2 closed | pins 1 & 2 closed |
   |-----------+--------+-------------------+-------------------|
   | 80486DX2  | Closed | pins 1 & 2 closed | pins 1 & 2 closed |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CPU SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   |   CPU type    |   CPU speed   |     JP5      |     JP6     |
   |---------------+---------------+--------------+-------------|
   |    80486SX    |     33MHz     |     Open     |   Closed    |
   |---------------+---------------+--------------+-------------|
   |    80486DX    |     33MHz     |     Open     |   Closed    |
   |---------------+---------------+--------------+-------------|
   |   80486DX2    |    50iMHz     |    Closed    |    Open     |
   |---------------+---------------+--------------+-------------|
   |   80486DX2    |    66iMHz     |     Open     |   Closed    |
   +------------------------------------------------------------+